src/mesa/swrast/s_logic.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 #include "main/glheader.h"
  27 #include "main/context.h"
  28
  29 #include "main/macros.h"
  30
  31 #include "s_context.h"
  32 #include "s_logic.h"
  33 #include "s_span.h"
  34
  35
  36 /**
  37  * We do all logic ops on 4-byte GLuints.
  38  * Depending on bytes per pixel, the mask array elements correspond to
  39  * 1, 2 or 4 GLuints.
  40  */
  41 #define LOGIC_OP_LOOP(MODE, MASKSTRIDE)         \
  42 do {                                            \
  43    GLuint i;                                    \
  44    switch (MODE) {                              \
  45       case GL_CLEAR:                            \
  46          for (i = 0; i < n; i++) {              \
  47             if (mask[i / MASKSTRIDE]) {         \
  48                src[i] = 0;                      \
  49             }                                   \
  50          }                                      \
  51          break;                                 \
  52       case GL_SET:                              \
  53          for (i = 0; i < n; i++) {              \
  54             if (mask[i / MASKSTRIDE]) {         \
  55                src[i] = ~0;                     \
  56             }                                   \
  57          }                                      \
  58          break;                                 \
  59       case GL_COPY:                             \
  60          /* do nothing */                       \
  61          break;                                 \
  62       case GL_COPY_INVERTED:                    \
  63          for (i = 0; i < n; i++) {              \
  64             if (mask[i / MASKSTRIDE]) {         \
  65                src[i] = ~src[i];                \
  66             }                                   \
  67          }                                      \
  68          break;                                 \
  69       case GL_NOOP:                             \
  70          for (i = 0; i < n; i++) {              \
  71             if (mask[i / MASKSTRIDE]) {         \
  72                src[i] = dest[i];                \
  73             }                                   \
  74          }                                      \
  75          break;                                 \
  76       case GL_INVERT:                           \
  77          for (i = 0; i < n; i++) {              \
  78             if (mask[i / MASKSTRIDE]) {         \
  79                src[i] = ~dest[i];               \
  80             }                                   \
  81          }                                      \
  82          break;                                 \
  83       case GL_AND:                              \
  84          for (i = 0; i < n; i++) {              \
  85             if (mask[i / MASKSTRIDE]) {         \
  86                src[i] &= dest[i];               \
  87             }                                   \
  88          }                                      \
  89          break;                                 \
  90       case GL_NAND:                             \
  91          for (i = 0; i < n; i++) {              \
  92             if (mask[i / MASKSTRIDE]) {         \
  93                src[i] = ~(src[i] & dest[i]);    \
  94             }                                   \
  95          }                                      \
  96          break;                                 \
  97       case GL_OR:                               \
  98          for (i = 0; i < n; i++) {              \
  99             if (mask[i / MASKSTRIDE]) {         \
 100                src[i] |= dest[i];               \
 101             }                                   \
 102          }                                      \
 103          break;                                 \
 104       case GL_NOR:                              \
 105          for (i = 0; i < n; i++) {              \
 106             if (mask[i / MASKSTRIDE]) {         \
 107                src[i] = ~(src[i] | dest[i]);    \
 108             }                                   \
 109          }                                      \
 110          break;                                 \
 111       case GL_XOR:                              \
 112          for (i = 0; i < n; i++) {              \
 113             if (mask[i / MASKSTRIDE]) {         \
 114                src[i] ^= dest[i];               \
 115             }                                   \
 116          }                                      \
 117          break;                                 \
 118       case GL_EQUIV:                            \
 119          for (i = 0; i < n; i++) {              \
 120             if (mask[i / MASKSTRIDE]) {         \
 121                src[i] = ~(src[i] ^ dest[i]);    \
 122             }                                   \
 123          }                                      \
 124          break;                                 \
 125       case GL_AND_REVERSE:                      \
 126          for (i = 0; i < n; i++) {              \
 127             if (mask[i / MASKSTRIDE]) {         \
 128                src[i] = src[i] & ~dest[i];      \
 129             }                                   \
 130          }                                      \
 131          break;                                 \
 132       case GL_AND_INVERTED:                     \
 133          for (i = 0; i < n; i++) {              \
 134             if (mask[i / MASKSTRIDE]) {         \
 135                src[i] = ~src[i] & dest[i];      \
 136             }                                   \
 137          }                                      \
 138          break;                                 \
 139       case GL_OR_REVERSE:                       \
 140          for (i = 0; i < n; i++) {              \
 141             if (mask[i / MASKSTRIDE]) {         \
 142                src[i] = src[i] | ~dest[i];      \
 143             }                                   \
 144          }                                      \
 145          break;                                 \
 146       case GL_OR_INVERTED:                      \
 147          for (i = 0; i < n; i++) {              \
 148             if (mask[i / MASKSTRIDE]) {         \
 149                src[i] = ~src[i] | dest[i];      \
 150             }                                   \
 151          }                                      \
 152          break;                                 \
 153       default:                                  \
 154          _mesa_problem(ctx, "bad logicop mode");\
 155    }                                            \
 156 } while (0)
 157
 158
 159
 160 static inline void
 161 logicop_uint1(struct gl_context *ctx, GLuint n, GLuint src[], const GLuint dest[],
 162               const GLubyte mask[])
 163 {
 164    LOGIC_OP_LOOP(ctx->Color.LogicOp, 1);
 165 }
 166
 167
 168 static inline void
 169 logicop_uint2(struct gl_context *ctx, GLuint n, GLuint src[], const GLuint dest[],
 170               const GLubyte mask[])
 171 {
 172    LOGIC_OP_LOOP(ctx->Color.LogicOp, 2);
 173 }
 174
 175
 176 static inline void
 177 logicop_uint4(struct gl_context *ctx, GLuint n, GLuint src[], const GLuint dest[],
 178               const GLubyte mask[])
 179 {
 180    LOGIC_OP_LOOP(ctx->Color.LogicOp, 4);
 181 }
 182
 183
 184
 185 /**
 186  * Apply the current logic operator to a span of RGBA pixels.
 187  * We can handle horizontal runs of pixels (spans) or arrays of x/y
 188  * pixel coordinates.
 189  */
 190 void
 191 _swrast_logicop_rgba_span(struct gl_context *ctx, struct gl_renderbuffer *rb,
 192                           SWspan *span)
 193 {
 194    void *rbPixels;
 195
 196    assert(span->end < SWRAST_MAX_WIDTH);
 197    assert(span->arrayMask & SPAN_RGBA);
 198
 199    rbPixels = _swrast_get_dest_rgba(ctx, rb, span);
 200
 201    if (span->array->ChanType == GL_UNSIGNED_BYTE) {
 202       /* treat 4*GLubyte as GLuint */
 203       logicop_uint1(ctx, span->end,
 204                     (GLuint *) span->array->rgba8,
 205                     (const GLuint *) rbPixels, span->array->mask);
 206    }
 207    else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
 208       /* treat 2*GLushort as GLuint */
 209       logicop_uint2(ctx, 2 * span->end,
 210                     (GLuint *) span->array->rgba16,
 211                     (const GLuint *) rbPixels, span->array->mask);
 212    }
 213    else {
 214       logicop_uint4(ctx, 4 * span->end,
 215                     (GLuint *) span->array->attribs[VARYING_SLOT_COL0],
 216                     (const GLuint *) rbPixels, span->array->mask);
 217    }
 218 }